problem in validate

[Nishant]

hi all,
i am gettin this error .
11/08 17:47:50 error
java.lang.NullPointerException
        at com.cybage.RegistrationForm.validate(RegistrationForm.java:98)
        at org.apache.struts.action.RequestProcessor.processValidate(RequestProc
essor.java:942)
        at org.apache.struts.action.RequestProcessor.process(RequestProcessor.ja
va:255)
        at org.apache.struts.action.ActionServlet.process(ActionServlet.java:148
2)
        at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)

        at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at jrun.servlet.ServletInvoker.invoke(ServletInvoker.java:91)
        at jrun.servlet.JRunInvokerChain.invokeNext(JRunInvokerChain.java:42)
        at jrun.servlet.JRunRequestDispatcher.invoke(JRunRequestDispatcher.java:
249)
        at jrun.servlet.ServletEngineService.dispatch(ServletEngineService.java:
527)
        at jrun.servlet.http.WebService.invokeRunnable(WebService.java:168)
        at jrunx.scheduler.ThreadPool$DownstreamMetrics.invokeRunnable(ThreadPoo
l.java:349)
        at jrunx.scheduler.ThreadPool$ThreadThrottle.invokeRunnable(ThreadPool.j
ava:457)
        at jrunx.scheduler.ThreadPool$UpstreamMetrics.invokeRunnable(ThreadPool.
java:295)
        at jrunx.scheduler.WorkerThread.run(WorkerThread.java:66)



my validator.xml file contains ---

<form name="registrationForm">
  <field property="fromAddress"
                     depends="required,email">
                 <arg0   key="prompt.fromAddress"/>
             </field>

            <field property="fullName"
                    depends="required">
              <arg0     key="prompt.fullName"/>
            </field>

            <field property="replyToAddress"
                    depends="email">
                <arg0   key="prompt.replyToAddress"/>
            </field>

            <field property="username"
                    depends="required">
              <arg0     key="prompt.username"/>
            </field>
 
 </form>

and in my struts-config.xml have plugins like 


  <plug-in className="org.apache.struts.plugins.ModuleConfigVerifier"/>

  <plug-in className="com.cybage.memory.MemoryDatabasePlugIn">
    <set-property property="pathname" value="/WEB-INF/database.xml"/>
  </plug-in>

  <plug-in className="org.apache.struts.validator.ValidatorPlugIn">
    <set-property property="pathnames"
                     value="/WEB-INF/validator-rules.xml,
                            /WEB-INF/validation.xml"/>
  </plug-in>
   

i aint able to find out why i am getting this error message 
can neone help !>?
Nishant Patil
Software Engineer
Cybage Software Pvt. Ltd. (A CMM Level 3 Company)
West Avenue , Kalyani Nagar,
Pune - 411 006
Tel: 91-20-4041700  -355
Email: [EMAIL PROTECTED]
Website: www.cybage.com
There's a difference between knowing the path, and walking the path